The PLANT-BIOLOGY group of BioSci is for general discussions about
research in plant biology. To sign up to receive that group via
electronic mail send a message to biosci at net.bio.net and ask to be
included on the PLANT-BIOLOGY list. That group is available via Usenet
as the bionet.plants newsgroup.
There are several other mailing lists around both in BioSci and as
separately run mailing lists that deal with topics within plant
science. Una Smith's biologist's guide to the internet, which is
periodically posted to bionet.general, contains many of these
non-BioSci mailing lists.
Mike